Composition of urine, faeces, greywater and bio-waste: For utilisation in the URWARE model

To analyse and compare new types of sewage systems, knowledge on the composition of the different wastewater fractions is needed. In some systems the compostable household waste is mixed into the wastewater by use of a food waste disposer and thus the composition of the solid compostable household waste is also needed. The objective of the present report was to compile well-validated default values on the mass and composition of urine, faeces, greywater and compostable household waste in Sweden for use in Substance Flow Analyses (SFA) of different wastewater systems. The proposed default values are developed to fill the needs of the simulation model URWARE. However, the use of the proposed default values are not limited to URWARE simulations, rather they can be used whenever default flows and somposition of the described fractions are needed. Where local conditions differ significantly from average Swedish conditions then modifications are certainly necessary, but for general base-line investigations of different treatment system the given default vectors should be valuable. However, the vectors contain no stormwater and no industrial wastewater and thus, whenever these fractions enter the wastewater system, their compositions need to be found elsewhere. The defined default vectors are based on a thoroughly analysed literature study and a few additional measurements. Default flows and composition are given for urine, faeces, household greywater and compostable household waste. For these fractions the composition is described by 31 parameters, the flow of water, total and suspended solids, organic matter, BOD7, total and fractioned COD, nitrogen, phosphorus, potassium and sulphur and flow of the heavy metals lead, cadmium, mercury, copper, chromium, nickel and zinc